The Tech Pron at Twitter – @techno_pron – is a bot that posts aesthetic tech pics. Most of these computers pictures were made on a solid (or close to it) background color so I though it may be a cool idea to create wallpapers from them.
I have picked up 20 most interesting ones and made high resolution backgrounds of them. Here is their montage.
To download them all just follow this wallpapers-oldschool-machines.tar.gz file.